Intramolecular Thiopalladation of Thioanisole-Substituted Propargyl Imines: Synthesis of Benzothiophene-Based Palladacycles
摘要:
A highly selective intramolecular thiopalladation has been achieved by the treatment of o-SiVeC(6)H(4)C equivalent to CC(CF3)(=N-4-OCH3C6H4), 1, with PdCl2(PhCN)(2) in THF at 0 degrees C to afford [(C8H4S-3-) C(CF3) (=N-4-OCH3C6H4) Pd(mu-Cl)](2), 4. The mechanistic implications of the results with the aid of low-temperature H-1 NMR and ATR-IR spectroscopy are discussed.
New cyclopalladated benzothiophenes: a catalyst precursor for the Suzuki coupling of deactivated aryl chlorides
作者:Madavu Salian Subhas、Shailesh S. Racharlawar、B. Sridhar、P. Kavin Kennady、Pravin R. Likhar、Mannepalli Lakshmi Kantam、Suresh K. Bhargava
DOI:10.1039/b927367k
日期:——
with an excess of phosphine ligands in benzene at roomtemperature selectively afforded trans-bis(phosphine) palladium complexes in good yields. The trans-bis(tricyclohexylphosphine) palladium complex was found to be an active catalyst in the Suzuki coupling of electron rich arylchlorides. The complex was also employed in the catalytic synthesis of stericallyhindered biaryls. The anticancer activity
Heck-type coupling of intramolecularly-generated thiopalladacycles with alkenes: One pot syntheses of 3-alkenylbenzo[b]thiophenes
作者:Manjusha V. Karkhelikar、Shailesh S. Racharlawar、Subhas M. Salian、B. Sridhar、Pravin R. Likhar
DOI:10.1016/j.jorganchem.2012.02.009
日期:2012.6
A method for stoichiometric functionalization of benzothiophene is developed by Heck-type coupling of alkenes with intramolecularly-generated thiopalladacycles obtained from palladium salts and ortho-thioanisole-substituted propargyl imines. The synthetic strategy for preparing structurally diverse 3-alkenylbenzo[b]thiophene is also extended to 3-alkenylbenzo[b]selenophenes. (C) 2012 Elsevier B. V. All rights reserved.